Cylinder ridge reamer



Feb 8, 1949- H. A. BEHKMAN CYLINDER RIUGEIREAMER 2 Sheets-Sheet l Filed May 15, 1948 Feb. 8, 1.94/9.

H. A. BERKMAN CYLINDER RIDGE BEAMER 2 Sheets-Sheet 2 Filed May 15, 1948 Patented Feb. 8, 1949 UNITED AsieTES yairis,NT orifice CYLINDER yRIDGE BEAMER -Herbert A.- Berkman, Chicago, Ill., assignor to Zim IManufacturing Company, a corporationiof Illinois 'Application May 13, 1948, Serial`N0.l26,857

(Cl. T7-'2) 6 Claims.

andfhavea cutterthat revolves about the cylinder v axis and `is Lautomatically `fed` lengthwise of the cylinderby'means'of a screwas the roaming proceeds; andit has for its-object to produce a machine thatshall be easy to adjust to cylinders of different sizes, over an-unusually wide range, and that shall-fbefvery eflicientand reliable in operation,1 andf'easy to operate.

`-"Sp`e"ciicallyl considered, the invention may be said tov have, for some of its objects, to produce anovel-and superior type of drive for the Vscrew that-'feeds the cutter and to providea simplified anchoring means for the reainer.

"lhefv'ariousv features of novelty whereby the presentiinvention is characterized will herinafter bei-pointed out with partioularity in the claims, but,'for afull understanding of the invention and `of itsobjects and advantages, reference may be had tothe following detailed description takenin connection 1vwith the accompanying drawings, wherein:

Figure 1 is what may be termed a front View or" a reamer embodying. the present invention, 'applied to a cylinder that is shown in section; yFig. 2 isfatoplan view ofthe reamer, with the cylinder appearing in 'transverse -section Fig. 3 isan axial section', showing onlyV a'v fragment of the machine; Fig. 4 is a side view of the ledge for operating the cutter feed, detached from the supporting table for `the reamer proper; Fig; 5 is -a side view of the upper portionof the reamer, looking fromv al point to the'left of'Fig.- .1, with the cylinder in section; Figi 611s' a section Online 6-6 of Fig. 5; Fig. 7 is opposite sides of-and in engagement `withthe a'viw similar to Fig. 6, with the cover plate for I a vertical star Wheel omitted; Fig. 8 is a -view looking` up from the level of line 8-8 of Fig. 6; and Fig. 9'is-a view somewhate similar to Fig. 7, showing a-slight modification.

priormachines,4 the reamer proper is mounted-on' a' at support or table I, which may convenientlyv be' a thick disc cut away to form three equally spaced, stubby arms. Lying flat on the table is a rotatable slab-like part 2 that is held dwnby a headed bolt 3, as is the corresponding partfin myjpriorPatent No. 2,136,350. The'lower end lof the bolt isr screwed into a hub 4 on the under side of a thick, three-armed spider 5.

rSpider 5 is held against rotation relative tothe tableby a long pin or stud 6 which is lixed to the table and extends down between two of the arms of 1thesp'ider at their juncture. The spider may beiprovided-with two little' pins l, arranged'Y on lower end of pin or stud Each arm of the-.spider contains a deep channel extending throughout the length of the arm and having a bottom wall 9 that slants youtwardly and downwardly at an angle of". -In each channel is a shoe 8 in the form of a flat plateof a right angled triangular shape wherein the acute angles-.are 'both'45; the tips, at the acute angles, being cut-away.

The shoes are placed in the channels-with their hypotenuses resting against the bottoms or the latter and vone short edge of each bearing against 4the under side of the table. The vertical edge of each shoe contains a notch I l in which a resilient ring l2, surrounding the whole, is seated; the ring being at all times under tension, Each spider arm contains a wide, deepV notch I4, of distorted" V shape, to leave the resilient ring free to remain in contact with the shoes at all times.

When bolt 3 is turned in one direction, the spider isdrawn toward the table and theshoes are 'forced outward in the radial direction. The long, single slopes in the spider on which the shoes ride provide better bearings and a smootherac-V tion,and.make possible a much simpler construction than that'of theaforesaidpatent.

Overlying'part Zand fastened thereto so that'it may be adjusted radially of the axis ofthe 'tool isa large flat member or plate l5; this adjustability being 'due to fastening member l5 toV part E byla headed .screw i6 'that passes through a long slot l1 in member I5 and into part 2, as in prior constructions. Member I5 has-a forwardly projecting ear I8 adjacent to one side edge. VThis ear extends into a jaw I9 on one'end of a horizontal arm 20 and, together with a pin 2|, passing through ear and jaw, forms a hinge connection between members I5 and 2li. Member l5 has a second ear, 22,`

at the front'and at the side edge opposite that at which ear I8 is located. Rising from ear 22is a cam or eccentric pin 24 that lies in front of the free endvv of arm 20 and either holds the v'arm back or allows it to swing outwardly, depending on the angular position of the cam or eccentric'yall of which is, in principle, old construction. Behind the free end of arm '20 is a compression spring 25 which labuts at its front end against the arm at its rear end againsta lip 26 rising from member I5.

This spring at all times tends to swing the free end of arm 20 forwardly or outwardly.

At about the middle of arm'Zil is a Vcolumn 2l that rises well above the remainder of the arm; In the front side of this column, and extending from a, point near the upper end of the` column to a point `nearthe'loweredge ofthe" arm 20,'v`is4a Wide, deep recess 28 of uniform width. In the rear portion of this recess is a vertical screw 29 having on its upper end, above the column, a knurled head or nut 3U by which it may be turned. O`n the lower end of the screw is fastened a horizontal five-armed star wheel 3i. The head or nut and the wheel hold the screw against endwise movement. In the iront or outerpart of the recess is a block 32 that serves as a carrier for a cutter blade 34. The screw is in screwthreaded relation with the block or blade carrier, so that when the screw is turned the latter moves up or down as the case may be.

In the rear or inner side of arm 2D is a shallow recess 35 in which is mounted, for rotation about a radial axis, a vertical, five-armed star wheel 36 that projects down into mesh with star wheel 3| and well below the plane of the latter. When wheel 36 turns it drives wheel 3l and turns the screw.

In order to turn star wheel 35 I mount on table l, at the outer end of one of its arms, a radial ledge 31 of considerable length. This ledge is high enough to project up into the path oi the lowermost arm of the vertical sta-.r wheel, once during each revolution of member l5, the parts being so proportioned that, as the arm by which the vertical star wheel is being turned moves on over and past the ledge, the arm immediately ahead is swung down far enough so that it will strike the ledge at the end of the next revolution of the member l5. Thus it takes ve revolutions of member l to turn the star wheels and screw through a single revolution and raise the blade through a distance measured by a single turn of the screw thread.

The impact of the Vertical star wheel on the ledge and on the other star wheel is Very gentle, so that the drive is smooth and noiseless.

When member l 5 is adjusted radially, carrying the cutter blade nearer to or farther from the axis of the machine, the proper driving relation between the star wheel and the ledge is mainmained, because of the length of the latter. This remains true as long as member i5 is not shifted outwardly farther than necessary to operate effectively in a cylinder of the largest diameter in which the anchoring means can be used.

The present invention'is most advantageously employed for reaming automobile engine cylinders of the larger sizes, say up to about ve inches in diameter. Some cylinders however, have still larger diameters, say six inches. In order to adapt the same machine tothese very large cylinders, the machine has been designed so that it may easily be placed in condition to operate eiectively in such cylinders as well as in the cylinders for which the reamer is primarily intended. However, it is impracticable to use the same anchoring means throughout that range; and I therefore provide a second, wider set of shoes (not shown), that may be substituted for those shown, when one of the largest cylinders is to be reamed. In this latter case, the ledge 31 must reach out farther to remain in the path of the vertical star wheel. To make this possible, the ledge is made in the form of a flat bar, rectangular in cross section, and is set edgewise into a deep radial groove or channel 38 in member l. In one broad face of the bar are a plurality of depressions spaced apart lengthwise of the bar; two such seats, 39 and 40, being shown. A set screw 4 I, screwed in through the edge of member l, is adapted to enter either of the two seats when brought into registration therewith to secure the ledge in place. In the drawings, the set screw is engaged in seat 39, holding the ledge in what may be termed its retracted, normal position. When a very large cylinder is to be reamed, requiring the substitution of wider anchoring shoes: the set screw is loosened; the ledge bar is pulled lengthwise into its extended position with the seat 40 registering with the set screw; and the set screw is again tightened to secure the ledge in its new position.

As is usual in machines of the general type disclosed herein, the member l5 has a handle 42 rising therefrom at a point remote from the axis of the machine; this handle serving the double purpose of raising and lowering the machine in removing it from or placing it in a cylinder and of driving the machine in reaming.

A convenient way of mounting star wheel 3B is to make one of the wide walls bounding recess 35, in which this wheel is located, in the form of a removable cover plate; this plate providing a bearing for one end of shaft 23 that supports the wheel.

When the screw 29 is turned to adjust the cutter in the vertical direction, it is theoretically possible to leave the wheel 36 in such a positionthat the point of the arm that engages the ledge 31 at the near upper corner when the wheel reaches the ledge; such arm acting as a strut between thev ledge and the supporting shaft for the wheel and locking the reamer against turning. To prevent' this from occurring, a suitable indexing device may be provided to make it impossible for the star wheel to remain in an angular position that. leaves any one of its arms in the objectionable.

position. I have shown such a device in Fig. 9, the same comprising a spring-pressed ball M that projects a little into recess 35, while lying and movable radially of the wheel in the plane of the latter; the ball being so placed that whenever an arm of the wheel is brought into the unwanted position, another arm engages the ball which then acts as a camto turn the wheel slightly and thus avert the danger of locking the reamer against turning.

In Fig. 9 there is illustrated another small change; the wall of the recess that is in the form of a detachable plate in the first form being made integral with column or postV 21a, as would U be preferable in the case die castings were used.-

I claim:

1. In a cylinder reamer, a support, means secure said support in an engine cylinder at a' substantial distance from a ridge to be reamed, a member mounted on said support for rotary movements about the axis of 4the cylinder, a car'v rier for a cutting tool movable up and down on. said member parallel with said axis, a screw on said member connected with the device to raise and lower it, a horizontal star wheel fixed on said screw near said support, a vertical star wheel on said member meshing with the rst s tar wheel and adapted to turn the same, and a radial ledge on said support in, the path of said vertical star wheel to yturn the same through one step during1 each revolution Iof said member.

2. In a cylinder reamer, a support, means tov secure said support in an engine cylinder at a;

substantial distance from a ridge to: be reamed,

a member mounted on said support so as to beadjustable radially of and rotatable about the axis oi the cylinder, a carrier for a cutter movableup and down on said member parallel with said4 axis, a screw on said member connected with the carrier to raise and lower it, a horizontal. star 3. A cylinder reamer as set forth in claim 2,

wherein said member is adjustable radially on the support.

4. A cylinder reamer as set forth in claim 2, wherein the support contains a radial groove in which the ledge is seated, the ledge has in a side thereof a plurality of seats spaced lengthwise of the same, and a set screw on the support is positioned to engage any one of the seats when that seats registers therewith.

5. In a cylinder reamer, a support, means to secure said support in an engine cylinder at a substantial distance from a ridge to be roamed, a member mounted on said support so as to be adjustable radi-ally of and rotatable about the axis of the cylinder, an element mounted on said member for swinging movements from and toward said axis, a spring acting to swing said element away from said axis, a carrier for a out ter movable up and down on said element parallel with v said axis, a screw on said element connected 6 with the carrier to raise and lower it, a horizontal star wheel iixed on said screw near said support, a Vertical star wheel on said element meshing with the first s tar Wheel `and adapted tov turn the same, and a radial ledge on said support in the path of said vertical star wheel to turn the same through one step during each .revolution ci' said member. i

6. A reamer as set forth in claim l wherein the vertical star Wheel has a series of radial arms, and which includes, additionally, a springpressed ball mounted inthe path of the ends of said arms in position to engage an arm whenever ariother arm reaches a position that will make it thrust in a direction radially of that wheel against the ledge upon reaching that ledge.

HERBERT A. BERKMAN.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 2,004,741 Zimmerman June 11, 1935 2,136,350 Berkman Nov. 8, 1939 

